Respected Mam/sir

I am a girl , 22 years of age. Whenever I masturbate , a bump appears on my left side of vagina with swelling. This bump settles down within 2-3 days , if I don't masturbate. But whenever I do it again , it comes back. This is happening since last 1 month. What is it ? Is it something related to bartholin gland. I went to a gynaecologist , but at that time my bump was settled down and there was no trace of it so she said to leave it as it is. But after that also I get these bumps again and again. Please help me. Thanking you

I never had sex

Could be related to that gland, although hard to tell you it is over the Internet. There is one on either side of the vagina. They can become clogged, get irritated and swell with pain. You do not report this happening and it is a normall occurrence when this happens.